P2000 code

This has to do with the Engine Computer determining that the Catalytic Converter can not absorb enough NOx. It is very much the same as a P0420 code. See this article that addresses this subject. http://repairpal.com/OBD-II-Code-P0420 There is a software update for this problem as long as your vehicle is not a PZEV Hybrid, it applies to the ULEV Hybrids. Contact Honda here is the number - > TSB 07-036 came out in June 2007

I had the same problem with my 2004 Civic and the software had already been updated. The dealership said I had to replace both catalytic converters and it would cost over $3000. I found a direct fit rear catalytic converter for $179 and paid a garage $130 in labor to put it on. Would have done it myself but everything was too rusty. Either way, problem fixed for a little over $300 vice $3000.

Clean your EGR valve: http://www.civicforums.com/forums/115-engine/309151-diy-forgotten-tune-up-mods.html